MCB Supplementary Protector 20 A

The 20 A MCB Supplementary Protector is a compact, current-limiting miniature circuit breaker designed for use in control circuits, equipment protection, and as a supplementary protective device. It conforms to UL 1077 and IEC 60947-2 standards, offering reliable overcurrent and short-circuit protection in industrial, commercial, and residential applications. Ideal for installation in tight spaces, these devices mount easily on 35 mm DIN rails, feature fast thermal-magnetic tripping, and are available in multiple pole configurations and trip-curve options to match load characteristics.

Key Features

• 🔌 Rated Current: 20 A — Suitable for protecting control panels, lighting, and industrial loads 

• 🛑 Current-Limiting Protection — Rapid interruption of fault current within half a cycle to minimize energy let-through 

• ⚙️ Trip Curve Options (B, C, D, K, S, Z) — Choose B/C for resistive/standard loads, D/K/S for inductive or motor loads, Z for electronic equipment 

• 🧩 Pole Configurations — Available in single, 1P+N, 2P, and 3P variants for flexible wiring options 

• 🧱 Compact Size & DIN-Rail Mountable — Typically 17.7 mm width per pole, with captive screws and toggle lock for secure panel installation

• 🌡️ Operating Temp Range: –25 °C to +55 °C (or +60 °C for some models) — Engineered for industrial ambient conditions 

• 🛠️ Terminal Options — Standard or cable-in/cable-out terminals; some models support bus-bar connection 

• 📜 Certification & Standards — Complies with UL 1077, CSA C22.2 No.235, IEC 60947-2, CE, RoHS, VDE, CCC and DNV-GL where marked

Typical Applications

• Control circuit protection in industrial automation and PLC systems

• Supplementary protection for equipment like lighting or test instruments

• Motor control gear and inrush-prone loads (with D/K/S curves)

• Compact control panels, HVAC systems, and machinery

Why Choose This 20 A MCB Supplementary Protector?

• Reliable Safety: UL 1077 recognized thermal-magnetic design ensures dependable overload and short-circuit protection.

• Versatile: Multiple trip curves and pole options adapt to diverse load types and wiring needs.

• Efficient Protection: Current-limiting feature greatly reduces damage during faults.

• Space-saving & Secure: Slim DIN-rail design and captive hardware enable easy, mess-free installation and maintenance.

• Industrial-grade: Meets rigorous certifications for global deployment in critical environments.